PACE 203H – Instructions for Use
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Post-ventricular atrial refractory
period (PVARP)
Period after a ventricular event (whether sensed or
paced), during which synchronous ventricular pacing
is disabled, regardless of any atrial event.
PACE 203H divides the PVARP into two periods: an
absolute period and a relative period. In the absolute
period (90 ms) no atrial events are recognized. In the
relative period (the remaining) atrial events are regis-
tered, but not tracked. This algorithm prevents mis-
interpretation of ventricular events after premature
atrial events as extrasystoles (PVCs).
Premature ventricular contraction
(PVC)
A sensed ventricular event not preceded by a sensed
atrial event. Also named extrasystole.
Pulse
(Monophasic) electrical output of a pulse generator
intended to stimulate the myocardium.
Pulse amplitude
Magnitude of the pulse expressed in volts or milli-
amperes.
Pulse duration
Duration of the pulse.
Pulse interval
Time interval between identical points of two consec-
utive pulses, expressed in milliseconds.
Pulse rate
Number of pulses per minute
1 ppm = 1/60 s
−
1
P-V Delay (PVD)
Delay between the sensing of an atrial depolarization
and the subsequent non-triggered ventricular pulse
under the condition that no sensing of a ventricular
depolarization was detected by the pulse generator.
Refractory period
Period during which a pulse generator will not
respond to a beat.
Sensitivity
Minimum signal, expressed in millivolts, required to
consistently control the function of the pulse gene-
rator.
Summary of Contents for PACE 203H
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